GetAllDrivers lists all the registered drivers.

GetDriver returns a volume driver by it's name.

GetDriverList returns list of volume drivers registered.

Lookup returns the driver associated with the given name.

NewVolumeDriver returns a driver has the given name mapped on the given client.

Register associates the given driver to the given name, checking if the name is already associated.

Unregister dissociates the name from it's driver, if the association exists.